Make iommu_flush_iotlb_psi() and flush_unmaps() easier to read. Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx> --- drivers/pci/intel-iommu.c | 46 +++++++++++++++++++++----------------------- 1 files changed, 22 insertions(+), 24 deletions(-) diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index f4b7c79..5fdbed3 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -925,30 +925,27 @@ static int __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, static int iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did, u64 addr, unsigned int pages, int non_present_entry_flush) { - unsigned int mask; + int rc; + unsigned int mask = ilog2(__roundup_pow_of_two(pages)); BUG_ON(addr & (~VTD_PAGE_MASK)); BUG_ON(pages == 0); - /* Fallback to domain selective flush if no PSI support */ - if (!cap_pgsel_inv(iommu->cap)) - return iommu->flush.flush_iotlb(iommu, did, 0, 0, - DMA_TLB_DSI_FLUSH, - non_present_entry_flush); - /* + * Fallback to domain selective flush if no PSI support or the size is + * too big. * PSI requires page size to be 2 ^ x, and the base address is naturally * aligned to the size */ - mask = ilog2(__roundup_pow_of_two(pages)); - /* Fallback to domain selective flush if size is too big */ - if (mask > cap_max_amask_val(iommu->cap)) - return iommu->flush.flush_iotlb(iommu, did, 0, 0, - DMA_TLB_DSI_FLUSH, non_present_entry_flush); - - return iommu->flush.flush_iotlb(iommu, did, addr, mask, - DMA_TLB_PSI_FLUSH, - non_present_entry_flush); + if (!cap_pgsel_inv(iommu->cap) || mask > cap_max_amask_val(iommu->cap)) + rc = iommu->flush.flush_iotlb(iommu, did, 0, 0, + DMA_TLB_DSI_FLUSH, + non_present_entry_flush); + else + rc = iommu->flush.flush_iotlb(iommu, did, addr, mask, + DMA_TLB_PSI_FLUSH, + non_present_entry_flush); + return rc; } static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu) @@ -2301,15 +2298,16 @@ static void flush_unmaps(void) if (!iommu) continue; - if (deferred_flush[i].next) { - iommu->flush.flush_iotlb(iommu, 0, 0, 0, - DMA_TLB_GLOBAL_FLUSH, 0); - for (j = 0; j < deferred_flush[i].next; j++) { - __free_iova(&deferred_flush[i].domain[j]->iovad, - deferred_flush[i].iova[j]); - } - deferred_flush[i].next = 0; + if (!deferred_flush[i].next) + continue; + + iommu->flush.flush_iotlb(iommu, 0, 0, 0, + DMA_TLB_GLOBAL_FLUSH, 0); + for (j = 0; j < deferred_flush[i].next; j++) { + __free_iova(&deferred_flush[i].domain[j]->iovad, + deferred_flush[i].iova[j]); } + deferred_flush[i].next = 0; } list_size = 0; -- 1.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html